alleryStart learning →How does an alimentary canal differ from a gastrovascular cavity?
AIt secretes no enzymes of its own
BIt absorbs nothing into the body
CIt has a mouth at one end and an anus
DIt works only in aquatic animals
Answer & Solution
Correct answer: C. It has a mouth at one end and an anus
1. The alimentary canal is described as the more advanced of the two systems.
2. It is one tube with a mouth at one end and an anus at the other.
3. Food therefore travels one way and can be processed in stages along the tube.
4. A gastrovascular cavity has a single opening doing both jobs.
_Source: OpenStax Biology 1e (CC BY 4.0), Ch 34 "Animal Nutrition and the Digestive System", section Invertebrate Digestive Systems_
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